There's supposed to be a test/poll interactive widget here and it is the essential part of the page (it says "TEST" right in the title and doesn't have much text as an article).
You can see the widget working on the original page: https://gfycat.com/BruisedComposedDore

Since IV cannot represent this element in any form, it should be unsupported.
https://instantview.telegram.org/checklist#unsupported-content